Auxiliary air device for carbureters.



A. G. STEWART. AUXILIARY AIR DEVICE FOR GARBURETERS. APPLICATION FILED JAN. 5, 1911.

Patented June '18, 1912.

w mumm 1 "Ill 1 U I-[ ED STATES PATE T onnipn.

ALFRED c. srnwan'r, or Los .aNGELEs, enmromvm AUXILIARY AIR DEVIQE FOR CARBURETERS.

To all whom it may concern:

Be it known that I, Anmnn C.'STEWART, -a citizen of the United States, residingat -Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Auxiliary Air Devicefor Oarbureters, of which the following -1S a specification.

This invention relates to means for supplying auxiliary air to the mixture as it passes from a carbureter to an internal corn- -bustion engine, and the main object of the present invention is to provide for supply of theauxiliary air-in such manner as to prevent the deposit-ion of oil from the mixture on the walls of the manifold or induction pipe of the engine.

A further .object of the invention is to provide for supply of auxiliary air in such manner that it will be uniformly mixed with the carbureted air from the carbureter. Other objects'of the invention will appear hereinafter. v The accompanying drawings illustrate the invention andreferring thereto -Figure 1 is a vertical section of one form of the invention. Fig.- 2 is a horizontal section on line ac m Fig. 1. Fig. 3 is a horizontal section on line m -w Fig. 1. Fig. 4 is a vertical section showing a different form of the device. Fig. 5 is a section on line w -m" 1 designates the outlet portion of a car bureter which may be of any suitable or usual construction and maybe provided. with 7 a throttle valve 2- this member 1 constituting the inlet member or portion of the auxiliary air device. a

3 desi ates the induction pipe or manifold lea ing to the engine and constituting the outlet member or portion of the auxiliary air device. The auxiliary air device further comprises an intermediate member interposed between the outlet portion of the 4 5 carbureter and the induction pipe said intermediate member consisting of an outer annular member or chamber 5 which may be 1 formed on one of the members 1 and '3'or attached to said members in any suitable 5o manner, said annular member 5 being adapted to receive a ring 7 whose interior diameter may be substantially equal to that of the outlet 1 and the induction pipe3.- The member 5 is of'suflicient diameter to form between'the l ring 7,-a nd the. wall of said member an annular chamber or space 8 extending completely Specification of Letters Patent.

' Patented June 18, 1912.

Application fl1ed January 5, 1911. Serial Nb. 600,944.

around the ring, said member 5 being per forated as at 9, said perforations extending from said annular chamber to the outer air for admission of auxiliary air to said annular chamber. The ring 7 is supported in the annular member 5 in such manner as to provide for adjustment of the upper end a of the ring toward or from 'a seat or end wall 10 at the upper end of the chamber 8 in the member 5, and for this purpose the said. ring may be screw threaded as at 11 to engagein corresponding screw threads 12 in the member 5,- andan operating arm 13 may be provided on said ring extending "through a slot 14 in the member 5 and pro.-

vided with means 15 at its outer end for engagement with any suitable controlling rod or means tovary the amountof auxiliary air admitted. The opposing portions of the ring 7 and annular member 5,'constituted by. the top of the ring and the seat or walltat the upper end of the chamber 8, are preferably-conical and inwardly convergent so that the air passing therebetween from the annular chamber 8 ,to the interior of the device is subject to.acceleration by reason of the contraction of area and is delivered into said interior space at maximum velccity. The openings in the inlet member 1, intermediate member 5, the ring 7 in said intermediate member, and the outlet memher 3 are in line so as to present a substantially continuous passage for the current of" flui from the inlet member and the internal diameter is substantially the same in said inlet member, valve ring and outlet member, so as to minimize the resistance to the passage of fluid therethrough.

The operation is as follows: When the device is connected to the carbureter and engine and the engine is in operation, the' suction from the engine tends to produce a condition of partial vacuum in the interior of the device sothat air is drawn through the perforations 9 into the annular chamber 8 and passes thence through the annular inlet between the members. 7 and 5 into'the interior of the induction pipe 3. This inwardly passing or convergent annular sheet 105 of auxiliary alr tends to hold the'mixture passing ,through the device from contact with the walls of the induction pipe, thereby preventing ,or' reducing'to a minimum the deposition of theoil or the heavierconstit- 11o uents thereof on the walls of the induction pipe. This del'n r ery"of'the auxiliary air in a uniform annularsheet at all sides of the mixture has also the effect of insuring uniform mixture of the auxiliary air with the original mixture. The amount of auxiliary air admitted is controlled by operation of the arm 13.

In the form of the invention shown in Figs. 4 and 5, the annular auxiliary inlet is formed between the top or outlet end of the carbureter body 18 and a ring'19 which screws in an internally screw threaded annular member 20 on the induction pipe 21. Said member 20 is provided with downward extensions 22 connected to the outlet end ofthe carbureter, but leaving a space 23 extending continuously around the ring 19 so that the airentering through the inlets or spaces 24 between said extensions may, in passing through the, annular space 23, be

equalized before it passes to the annular inlet, so that it enters uniformly at all parts of said inlet. The opposing surfaces at the end of the oarbureter and of the regulating ring 19 adjacent to said inlet are convergent toward the inlet, so that the air is delivered at high velocity in an annular sheet at the outlet of the carbureter.

What I claim is 1. An auxiliary air valve for carbureters consisting of an inlet member having an inlet opening, an outlet member having an outlet opening, and an intermediate member between said inlet and outlet members, and comprlslng an outer annular member,

a ring supported therein, said annular member being provided with a continuous annular chamber extending around said ring and with perforations establishing communication from the outer air to said annular chamber, said outer annular member and ring being provided-with opposing portions forming an annular air inlet, and said outer annular member and ring being provided with interengaging screw threaded portions. 2.- An auxlhary air valve for carbureters consisting of an inlet member havlng an inlet opening, an outlet member having an outlet opening, and an intermediate member between said inlet and outlet members, and

com risin an, outer annular member a" ring supported therein, said annular member being provided with a conti uous annular'chamber extending around said ring and with perforations establishing communication from the outer air'to said annular chamber, said outer annular member and ring being provided with opposing portions forming an annular air inlet, said opposing portions being inwardly convergent and said outer annular member and ring being provided with interengaging screw threaded portions and the internal diameter of said ring being the same as the internal diameter of the said inlet member, and handle means on said ring extending through the outer annular member, said outer annular member having an opening for receiving and enabling adjustment of.

said handle means.

In testimony whereof, I have hereunto set my hand at Los Angeles, California,'this 23rd day of December, 191

ALFRED c. STEWART.

In presence of ARTHUR P. KNIGHT, FRANK L. A. GRAHAM. 

